GASKET 3G5922 - Caterpillar

Table 3
Cavitation Test Results
Calculation Equation Result
Lower Limit of Acceptable Pump Rise
(line b-b) (b-b) = (Pump Rise @ 120°F) x (100% - 10 %) _________________ kPa (psi)
Cavitation Requirement (1)
(Point (c)) (c) = Pump Rise Pressure at intersection of lines (a-a) and (b-b) _________________ kPa (psi)
Pump Cavitation Temperature
(Tc) 210°F - (Engine Heat Rejection (BTU/min)) / 8.1 x Pump Flow ((gal / min)) _________________ °F
Barometric Pressure Adjustment
(Adjusted Tc) Add 1°F for each 0.5 inches Hg. below 29.60 inches Hg
or
Subtract 1°F for each 0.5 inches Hg. above 29.60 inches Hg _________________ °F
Pump Rise @ Corrected Tc(2)
(Actual Cooling System Pump Rise Pressure) Δ Pressure = Pump Rise Pressure at intersection of line (a-a) and Temperature Tc _________________ kPa (psi)
Cavitation Test Results
(Pass/Fail) Pass = Pump Rise @ Corrected Tc ≥ Cavitation Requirement
Fail = Pump Rise @ Corrected Tc < Cavitation Requirement Pass
or
Fail
Test Date:
Engine Model/Serial Number:
Engine Application:
Technician:
(1) Use this value as requirement for the pump rise pressure for the cooling system
(2) Use this value as the resulting pump rise pressure for the cooling system
Calculate the lower limit of acceptable pump rise for the cooling system (line b-b).
First, subtract the percent of allowable pump rise loss acceptable for the engine model from 100 percent.Note: The percent of allowable pump rise loss acceptable for C175 Gen Set Engines is a maximum of 10 percent.
Multiply the resulting decimal value (numeric percentage) by the pump rise value recorded at 49° C (120° F) on (plot a-a).
The result is the lower limit of acceptable pump rise. Record the result in Table 3.
Use the result to draw line (b-b) on the graph. Extend the line across plot (a-a). This line will establish the lower limit of acceptable pump rise.Refer to Illustration 5 as an example.Note: By drawing a vertical line down to the pump outlet temperature axis, the cavitation temperature for the cooling system is revealed.
Read the pump rise pressure at point (c). This point is the cavitation requirement of the cooling system. Record this pump rise pressure in the proper place in Table 3.
Determine the cavitation temperature (Tc) for the cooling system:
Reference the Technical Marketing Information (TMI) data for the engine to obtain the following values:
Engine heat rejection (BTU/min)
Coolant pump flow (gpm)
Calculate Tc by first dividing the engine heat rejection value by the coolant pump flow. Subtract the resulting temperature from 210 (degrees fahrenheit).The resulting temperature is the uncorrected cavitation temperature (Tc) for the engine cooling system.Record the uncorrected cavitation temperature (Tc) in the proper place in Table 3.
Correct the cavitation temperature (Tc) by adjusting for the site barometric pressure that was recorded earlier in Table 2:Add 1 degree to Tc for each 3.4 kPa (1 inch mercury) that the site barometric pressure is below 100 kPa (29.60 inch mercury).Subtract 1 degree to Tc for each 3.4 kPa (1 inch mercury) that the site barometric pressure is above 100 kPa (29.60 inch mercury).Record the corrected cavitation temperature (Tc) in the proper place in Table 3.
Locate the pump rise pressure on the plot of engine cooling system performance (plot a-a) at the